Pipe-wrench.



W. R. EVANS.

PIPE WRENCH.

APPLICATION FILED MAILa, 1912.

L'YQQS@ Patented Oct. 7, 1913.

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NORAPH CD WASHINGTON D C WILLIAM R. EVANS, F SMITHS BASIN, NEW YORK.

PIPE-WRENCH.

Specification of Letters Patent.

Patented @et 7,1913.

Application filed March 5, 1912. Serial No. 681,782.

To all whom, t may concern.'

Be it known that I, WILLIAM R. EVANS, a citizen of the United States, residing at Smiths Basin, in the county of `Washington and State of New York, have invented new and useful Improvements in Pipe- Vilrenches, of which the following is a specication.

rllhis invention relates to pipe wrenches of that class in which a rocking jaw is used in connection with a fixed jaw, the device also comprising means whereby the jaws may be adjusted toward and away from each other without interfering with the rocking operation thereof, the construction admitting' of the rocking jaw receding automatically when the device, as a whole, is moved backward to obtain a fresh grip on the object.

The main object of the present invention is to provide an arrangement of adjusting and locking dogs so as to remove all strain from the pivots of the dogs, the strain being imparted entirely to the yoke which connects the two main elements of the device,

thereby greatly increasing the life and durability of the wrench, as a whole.

rllhe invention consists in the construction, combination and arrangement of parts, set forth in and falling within the scope of the appended claim.

fn the accompanying drawing Figure 1 is a side elevation of a pipe wrench embodying the present invention. Fig. 2 is a transverse section through the same, taken on the line QAQ 0f Fig. 1. Fig. 3 is a detail perspective view of a portion of the main handle, including the fixed jaw. Fig. 4 is a detail perspective view of one of the dogs.

rlhe handle of the wrench illustrated at 1 is provided at one end with the fixed jaw 2 having the usual serrations or teeth 3.

The movable or rocking jaw 4 is provided with a shank 5 and the latter, it will be noted, is provided on opposite sides thereof with longitudinal rows of indented teeth 6, said teeth lying wholly within the plane of the opposite sides or faces of the shank so as to leave the opposite parallel bearing faces 7, the object of which is to admit of a smooth, sliding action of the shank through the yoke hereinafter referred to.

The two main members of the device thus far described are connected for relative movement, by means of a yoke 8 which eX- tends entirely around both members, as

clearly indicated in Figs. 1 and 2, said yoke being pivoted at 9 to the liXed jaw 2 at one end of the handle 1.

llhe yoke 8 is provided in its opposite f sides with apertures 10 in which pivoted dogs 11 are mounted to work. @ne of said dogs is shown in detail in Fig. 4, wherein it is seen to comprise upon its inner face a series of teeth 12, the teeth 12 being adapted to engage the teeth 6 above referred to for the purpose of preventing any relative longitudinal movement between the shank 5 and the handle l. This serves to hold the jaws of the wrench in a certain relation to each other or at a distance suitable to grip the object being operated upon. Each dog also comprises a thumb piece or lever' eX- tension 13 and said. dog is mounted upon a pivot pin 14, which, it will be noted, eX- tends in a plane parallel to the length of the Shank 5. rllhe object in arranging the pivot pin 14 in the relation specified is to remove the strain from said pivot pin and place the same upon the yoke whenever there is any tendency for the shank 5 to slide in and through the yoke, which action always takes place when the device is operated for turning a pipe or other object gripped between the jaws of the wrench.

The dogs 11 are maintained in engagement with the .shank 5 by means of springs 15 interposed between the lever extensions 13 and the handle 1, while the outer eX- tremities of the jaws 2 and 4 are normally but yieldingly urged toward each other by means of a cant spring 16 interposed between the handle 1 and the shank 5 and conneet-ed to one of said elements.

lt will be understood that the operation of the wrench, as a whole, is automatic after the jaws have once been adjusted in the proper relation to each other or brought to the desired distance from each other. ln the back and forth movement of the handle 1, the movable aw 4 automatically releases itself to obtain a new grip on the pipe or other object, and instead of the strain being thrown upon the pivots of the dogs, said strain is borne directly by the yoke 8 which is continuous in cross section or in other words, extends entirely around the shank 5 and handle 1 and is, therefore, capable of sustaining all the strain to which the device is normally put.

I claim A device of the kind described comprisman.

ing a fixed jaw and a movable jaw, a'ha'n'dle" formed integrally with each-1 ltli'et-ha'n-W dle of said movable jaw being set with its edge opposed to that of said fixed Ija'xvya cant spring secured upon one edge of the' fia/:ed -jaw handle, a yoke surrounding said handles and being fulcrumednpon said fixed jaw, said Cant spring bearing against the adjacentz edge of thev movable y.jawv hanpendtionlai-'ly to .the adjacentledge A'of-thee iXed jaw handle, tvvo dogs having toothed portionsV proj ee'tinggthrough the sides of said yoke and into the said racks, pivots mountvedl 'on-'f said yoke upon which said dogs are fulorumed, and springs engaging said dogs Iarranged to cause saidy toothed *portions`4` to ineshwvith said :racks and to simultaneously support the movable jaw handle.

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